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Writing an Operating system
As a learning experience... Inspired by people like.. Linus Torvalds and Andreas Kling
The goal
Writing a hobby operating system to better understand the basic building blocks of any operating system.
Operating System Technical specs/details
Currently the operating system is in the planning fase. I hope to soon have the basic output and booting sequence with multiboot done.
Planning
[x] Muliboot to kernel
[ ] Printing strings and integer numbers (both decimal and hex) on the screen is certainly a must. This is one of most basic ways of debugging, and virtually all of us have gone through a kprint() or kout in version 0.01.
[ ] Outputting to a serial port will save you a lot of debugging time. You don't have to fear losing information due to scrolling. You will be able to test your OS from a console, filter interesting debug messages, and automatize some tests.
[ ] Having a working and reliable interrupt/exception handling system that can dump the contents of the registers (and perhaps the address of the fault) will be very useful.
[ ] Plan your memory map (virtual, and physical) : decide where you want the data to be.
[ ] The heap: allocating memory at runtime (malloc and free) is almost impossible to go without. It should be implemented as soon as possible.
Other features I am thinking of:
[ ] USTAR Filesystem ( For its simplicity this is very likely the first filesystem the OS is going to support)
[ ] Memory Management
[ ] Scheduling (Unknown what the scheduling algorithm will be, as with everything suspect simplicity)
[ ] RPC - for interprocess communication
[ ] Sync primitives - Semaphores, Mutexes, spinlocks et al.
[ ] ACPI support ( Or some other basic way to support shutdown, reboot and possibly hibernation )
[ ] ATA support
[ ] Keyboard support ( must have )
[ ] Basic hardware recognition ( CPU codename, memory, ATA harddisk, RAW diskSpace, CPU speed et al. )
[ ] Basic Terminal
[ ] Simplistic draw ( maybe ?!?) \
Far in the future: \
[ ] Basic Window server/client
Support for more filesystems if I like the challenge in writing these ...
[ ] FAT Filesystem [ ] EXT2 Filesystem